Bitcoin will never provide fast and cheap transactions, which is why projects like STX were developed in the first place. The ultimate goal for Stacks was to create a Solana-like Bitcoin L2 called Nakamoto. The new Nakamoto upgrade also introduced $sBTC which can be used in DeFi. $sBTC just launched with a 1,000 BTC cap (about 100 million), which filled quickly because of the 10% APY on BTC.